Grid-resistance.



F. L. SESSIONS.

GRID RESISTANCE.

APPLICATION FILED OUT. 21, 1909. 1 ,03 1 ,382. Patented July 2, 1912.

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Patented July 2, 1912.

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GRIlthRLEElISTAE.

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Specification of Letters Patent.

Patented stay aisle;

Application filed ctober'21, 1e09,, Serial no. saassa satisfactory means for electrically connect- 112g together the ends of the grlds and for satisfactorily connecting. the lead wires to the grids.

X Til the -.accompanying drawings, 1 have I shown one embodiment of my invention. 1

do not desire, honvever, to be limited to the exact formof construction which I haveshown, and various changes of detail may be made Within the scope of my invention.

' {lithe drawings lfigure 1 1s a side elevation of a grid resistance embodying my '.invent1on, a portion being shown in cross section. Fig.2 is a planvievz. Fig. 3 is adetail view or" one ot the gr ds. Figs. l

U aiid '5 are detailed yiews of one of the wire is a detail view of connectors. "Figs. 6 and 7 are detail views of one of the connect ng washers. .Tdhg. 8

staples.

Referring to the drawings, 1 represents a so far as my resent invention is concerned, this grid ay be of any usual or desired form. That which it prefenhow ever, and which I have shown in the drawings for purposes of illustration, is zig-aag shape to form a resistance element having as. long a path as possible for the current.

The grid i-is provided with supporting rings,

preferably, three in number, and cast inte witlr the resistance element. These rings are designated in the drawings by 2.

At each end of eachgrid is formed a projection 3 having therein one or more, preterably two, small holes l. These holes should preferably be drilled and reamed so -thatthey will be slightly tapering.

Theresistance as a whole is built rip of aplnrality of the grids above described. One convenient means Esii portmg the grids is shown in the 'drawmgs. V v

5.,- 5 are end frame plates and are providedwith lugs 6, 6', by means of which the shown in Figs. .6 and 7. It will be noted title of the connecting resistances may be bolted to the frame of the locomotive or to anyother device in connection with which it is to be used. Each of the plates 5 is provided with apertures to correspond with the holes in the rings 2.

The bolts 7.. 2' are each provided with an insulating tube 8 and are passed through the openings in the plates and gridsf By means of the-nuts on the bolts 7, the plates and grids are securely locked together. Tnsulating washers 9 and 16 are provided to prevent electrical communication between the grids and the plates. Between the middle rings of the various grids I provide insulating washers 11. Between the end rings oi the grids lllprovide ducting material, such as copper, or washers 12 of insulating material, according to whether or not I desire-to form electrical connection between the ends. The copper washers may be of either of twoforros designated in the drawings by 13 and 14 re; spectively. Those marked 13- are simply fiat sheet washers. The washers 14: are best that they comprise simplyasheet of metal doubled upon itself-to form two parallel connected washers. The double washers 14 either washers of conare of such size that one or two or even more grids maybe inclosed hetween'the two parallel parts thereof. in the drawings, 1 have shown them inclosing two grids.

15 is a staple, preferably/formed of cop-. per wire and adapted .to enter the tapered holes. i in the ends of thegrids. These staples may be used for'connecting together the ends 01 the grids in anyone ot -a large variety of ways. y p

16, 16 and 17 represent connectors for the lead wires. The connector 17 is adapted to he inserted hetweentwo rids to are the."

. 5 8 place of one of the washers l-l or 1%.;

18 is an aperture smaller to the apertures inthe ,grids. Thismaltes it possihle for the connector to darectly.

of the bonded- "to one.

.95 to receive two wires, while the connectors 16 and 16* are adapted to receive but one each,

led:

In Fig. 1, I have shown the grids conneoted in series betweenthe connectors 16 and 16 the grids are connected in a double parallel series. This arrangement is shown merely for purposes of illustration, and by interchanging the staples, the various washers and the lead wire connectors, an almost infinite variety of resistances can be obtained.

It will be noted that I have obtained by my invention a very direct and certain electrical connection between the grids. For instance, in the upper left hand corner of Fig. l where the four ends are connected together, it will be noted that all four 'are'connected 'in three distinct ways, first directly through one another; second through one another by means of the staples 15; third through the connecting part of the double washer 14.

In the drawings, I have shown the staples 15 as of sufficient length to extend the greater part of the .distance through the apertures 4. It may, however, be found preferable in some cases to make the staples shorter and to'provi de two series of staples,

,one series for the ends of the apertures 4:,

which are on one side of the resistance, and the other series for the opposite ends of the apertures 4:.

What I claim is- 1. In a grid resistance, the combination of a plurality of grids, insulated means for supporting said grids in parallel relation to one another, and a double washer of conducting material comprising two parallel parts with a connector between, each of said parallel parts of the washer being adapted to lie be- Y tween and in engagement with two grids,

substantially as set forth.

2. In a grid resistance, the combination of a plurality of grids, insulated-means for supporting said grid's,.and a connecting member of conducting material comprlsing a plurality of connected parts, each of said parts Between the connectors 16 and 17 being adapted to lie between and engage with two grids,-substantially as set forth.

'3. In a grid resistance, a plurality of grids arranged in parallel relation one with another, each grid being provided at each end with an aperture, the apertures in the corresponding ends of all of the grids being parallel to one another and similarly located, and a plurality of staples consisting of a wire bent with one part parallel to another part, the said parts being adapted to enter the apertures of two grids, substantially as set forth. 4. In a grid resistance, the combination of a plurality of grids, insulated'means for supporting said grids, and a lead-wire connector having a part adapted to engage with one end of one of the grids, said grid and said connector being each provided with small elongated apertures, which apertures are parallel to oneanother, and a staple consisting of a wire bent with one part parallel to another part, the said parts being adapted to enter the apertures of the grid and the con nector, substantially as set forth.

5. In a grid resistance, the combination of a plurality of grids, insulated means for supporting said grids in parallel relation to one another a double washer comprising two parallel washer-like plates with a connector between, each of the said washer-like .plates lying between and in engagement with two grids, each of the grids with which the double washer engages having a small elongated aperture and. a plurality of connecting staples adapted to enter the said apertures and electrically connect the said grids, substantially as set forth.

In testimony whereof I aflix'my signature, in presence of two Witnesses. I

- DUDLEY T. FISHER,-

E. P. SNIVELY. 

